Motor and drive connection



Feb. 9, 1932. G. W. HODDY ET AL 1,844,121!l MOTOR AND DRIVE CONNECTION Filed Aug. 2,*1930 J7 j. ll' J3 jg Patented Feb. 9, 1932 UNITED STATES PATENT-ortica GEORGE W. IIODDY AND LEO DEUTSCH, OE SPRINGFIELD, OHIO, AssIeNORs To EOBEINS a MYERS, INC., OE SPRINGFIELD, OHIO, A CORPORATION OE OHIO i iiIoTOial AND DRIVE CONNECTION rIhis invention relates to a new and improved motor and drive connection, and more particularly to such a drive and motor adapted for use in moving the tuning condensers 3 or other timing or control devices .whereby remote controlv of suoli radio may be had.

Themotor maybe started and stopped by closing and opening the motor circuit at a point remote from the motor. The motor and drive connections will be located at the radio set-and directly connected to the set Which thus may be located at a lpoint distant from the motor control switch.

The particular details of the motor and 16 motor control circuit form no part of the present invention, but are disclosed in our copending application Serial No. vember 23, 1929.

It is an object of the present invention. to

20 provide a motor and motor drive connection adapted for use in Operating tlie controls ofa radio set. or the like.

It is afurther object of the invention to provide a connection for such motor drive 25 adapted to maintain the motor normally-dis# connectedfrom the set controls and to automatically connect the motor to the; set when the motor'reachesthe desired-operating speed.

A It is also an object to provide a connection 3D adapted to prevent injury to the radio set or the like by overrunning of the motor beyond the control limits of the set. i

It is an additional objectto provide a coniiection permitting setV operation Without absolute alignment of the drive with the set Operating controls.l v

It is a further object to providc'a control motor andV connect-ionadapted for use With eX- ist-ing types of radio sets Without material Le i alteration therein.

Other and further objects will appear as the description proceeds.v

We have shoivn certain preferred embodiments of our invention in the accompanying drawings, in Which- Figure 1 is a longitudinal vertical section through the station selector motor and lclutch control apparatus; 5o Figure 2 is a cross-section atvright angles to 409,382, filed NO Figure 1 throughthe gear box and clutch mechanism; r

Figure v3 is a horizontal cross-section through the operating mechanism of Fig# ure 1; i

2 as seen from the left; and

-Y 55 Figure 4 is a vieW of the clutch of Figure f' Figure 5 is a view of the motor and housing Y of Figure 1 as seen from the left.

In the drawings, the frame 11 carries the motor housing 12Which contains the motor field 13 and the motor rotor 14 secured to shaft 15. This shaft 15 has an end bearing 16 carried by the housing 12. The Aopposite side of the frame 11 carries the housing 17 which encloses the gear train and VWhich-is provided with a bearing at 18 supporting the opposite end ofthe motor shaft 15.

The yoke 19 is secured to the shaft 15 by a pin 20Which causes the yoke to rotate `With the shaft. The yoke 19 has pivotally supported thereon at the points 21, the bell crank levers 22l carrying the Weights 23. The short arms 24 of these bell'crank levers engage a collar 25 which is. slidably mounted on the shaft 15..' Through the medium of avballbearing collar26lthe collar25 thrusts against a sleeveV 27 Which is -slidabl-y fitted upon the shaft 15 and providedvvvith thev axially eXf tending lugs 28 which are located above and below the shaft 15 andpfit into recesses 29 formed in arms of the bell crank lever 30.

The interfitting of the lugs28 and recesses 29 prevents rotation of the collar'27@l The bell crank levers 30 are. pivoted at 31 to a frame 32 supported inthe housing inember 17. The shaftV 15 is formed with a Worm gear 33 Which meshes with azgear 34 carried by the vertical shaft 35. The shaft35 is also formed withy a gear 36 vvhich meshes With a gear 37 carried on-the horizontal shaft 38. This shaft 38'has an end bearing at 39 against the frame 32 and is fitted Within a sleeve 40 which is carriedA in abearingV 41 formed in the frame 32. This sleeve 40 has a ring 42 fitted in a slot therein anda spring '43 is located upon the sleeve andwhich thrusts at one end against the bearingv41-and at the. other end against'the ring 42vso as to normally urge the sleeveto 'the right in'Figure`2ior end of the sleeveV 40 at points above and below the shaft38. The outer endof the sleeve 40- carries the clutchl disc 46 which is vrigidly secured to the sleeve. provided with a counterbored or recessed por-y tion 47 within which is located a Shoulder48 on the shaft 38. This shoulder acts as a re'- tainer for a steel washerV 49, which washer enf` gages the end of a compression spring 50, the opposite end ofwhich engages a collar 51 which is fr ee to rotate on the shaft 38. VThis spring tends to thrust the collar 51 to the left or towards the outer endof the shaft.

At the outer end of the shaft-38 are the adjusting nuts ,52 which directlyengage a washer 53 actinggas a retainer-for the ball thrust bearing 54. Adjacent this ball thrust bearing 54 is a disc 55 of insulating material which acts as oneplate Vof. a friction clutch. This disc 55 is free to rotate upon the shaft 38. A disc 56, rotatably fitted upon shafty 38, carries a facing 57 of suitable clutch material adapted to engage the disc 55. v This disc 56 is normally thrust against the disc 55l by the collar 51 and spring 50 through the interposed thrust bearing 58.y This provides a clutch unit which is Afree to revolve on'the shaft 38. j

The collar 59 is secured to the clutch disc 55 by means ofthe spring 60, the opposite ends of which are secured to the disc 55 by screws 61. The collar Y59 is provided witha threaded opening 62 receiving a set screw to connect it to the shaftV ofa condenser or other radio control or tuning'devicewhich i is rotatably operable. `The spring forms a ieXible connection between this disc 55 and the timing elementfwithin the radio, and obviates the necessity for absolute accuracy of alignment between the connection and radio shaft.

.force acting upon weights 23. The arms 24 thrust lagainst collar 25 and sleeve 27 and its p lugs 28 are thrust against thebell crank lever 30. Movement of this lever is resisted by the springV 43 and when the lforce'applied byle- This clutchdisc 46 is l vers 22 and their weights 23 is sufficient to overcome the resistance of this spring, the clutch disc 46 is carried against the clutch disc 56. This disc 56 then drives the disc 55 and the radio control shaft is operated through spring 60 and collar 59.

When the desired tuning point is reached, the motor switch is opened to open the motor circuit and the motorV stops. The motor is of a type adapted to stop without overrunning after the circuitisopened. Further, there is a great gear reduction between the motor Vand radioset shaft so that a slight overrun will have, an extremely slight effect on the tuning shaft.;

Afurther feature to minimize anypo'ssible overrunof the tuning shaft lies in the form of operating connection. As soon as the rotorl sh'aftpstarts to slow up,; the -spring 43 overcomes the centrifugal force acting'l through the weights 23 on the bell lcrank levers 22, and this spring 43 thrusting against ring 42.moves the sleeve 40 to the right, drawing the clutch disc 46 out of contact with disc 56 and breaking the Vdrive connection.

It is customary Vin radio-tuning devices to provide stops which limitgthe angular movement or rotation of the devices. Itis, ,therefore,vnecessary to provide means to prevent damageto the parts should the stops be engaged and Athe motor continue to run. This is accomplished in our construction by the friction discs 55 and 56. The disc 55 is positively connected to the radio control lshaft and disc 56 is positively driven by clutch disc 46. The frictional engagement betweenv discs 55 and 56 is limited to an amount which will not injurethe parts and the stops.' If the motor continues to run, `the discs 46 and56 willbe driven, but there will be slippage be-y tween discs 56 and 55and the lattery disc will not move.

' The disc 46 is disengaged from disc 56 when the motor is stopped. The discs 56 and 55 are both free to rotate on shaft 38. l Consequently when the motor is not in operation the radioy set maybe tuned byhand without encountering any lresistanceY from the power drive unit. 7 While we have shown certain preferred forms of our invention, these are to be understood as illustrative only, as we contemplate such changes and modifications as come within the spirit and scope ofthe appended` claims. s v

l. Ina motor drive construction,l a motor, a cross shaft driven by the motor, a .clutch iuember rotatable on the cross shaft and adaptedto be connected to a driven shaft,a clutch member rotatable with the cross shaft and carried by a sleeve slidablyiiitted on said for normally holding the clutch members out of engagement. l

2. In a motor drive construction, a motor, a cross shaft driven by the motor, a clutch member rotatable on the cross Shaft and adapted to be connected to a driven shaft, a clutch member rotatable with the cross shaft and carried by a sleeve slidably fitted on said shaft, a bell crank member engaging said sleeve to force the clutch members into engagement, a sleeve carried by the motor shaft engaging the bell crank, centrifugal members carried by the Vmotor shaft adapted to thrust said sleeve against the bell crank, and a spring carried by the sleeve for normally holding the clutch members ont of engagement.

3. In a motor drive construction, a shaft driven by the motor, a clutch member loosely fitted on said shaft, means to connect said clutch member to a driven device, a secondy clutch member loosely .fitted on the shaft and adapted to make a yieldable connection to the first clutch member, and a third clutch member driven by the shaft and adapted to positively engage the second clutch member.

4. In a motor drive construction, a shaft driven by the motor, a clutch member loosely fitted on said shaft, means to connect said` clutch member to a driven device, a second clutch member loosely fitted on the shaft and adapted to make a yieldable connection to the first clutch member, a third clutch memf ber driven by the shaft and adapted to positively engage the second clutch member, means normally maintaining the third clutch member out of engagement with the second clutch member, and means to force the clutch members together upon a predetermined speed of rotation of the motor.

5. In a motor drive construction, a shaft driven by the motor, a clutch member loosely fitted on said shaft, means to connect said clutch member to a driven device, a second clutch member loosely fitted on 'the shaft and adapted to make a yieldable connection to the first clutch member, a third clutch member driven by the shaft and adapted to positively enga-ge the second clutch member, a spring normally maintaining the third clutch member out of engagement With the second clutch member, a bell crank adapted to force the clutch members together against resistance of the spring, and centrifugal means rotated by the motor shaft to operate the bell crank upon a predetermined speed ofl rotation of the motor.

6. In a motor drive construction, a shaft driven by the motor, a clutch member loosely fitted on said shaft, means to connect said clutch member to a driven device, a second clutch member loosely fitted on the shaft and adapted to make a yieldable connection to the first clutch member, a third clutch member driven by the shaft and adapted to positively of July, 1930.

GEO. W. HoDDY.

LEo DEUTSCH.y 

